But with great power comes great responsibility: By becoming a social media star, fans expect you to be an avid poster, a role model, and an open book. While the Kardashians may enjoy sharing their every move, not every celebrity is so inclined.

"I can’t think of anything I’d rather do less than have to continuously share details of my everyday life,” Scarlett Johansson famously told Interviewback in 2011.

From protecting their privacy to simply not knowing what to post, here are 21 celebrities who don’t use social media and their reasons for steering clear.

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1.
Jennifer Lawrence

"I will never get Twitter. I'm not very good on [a] phone or technology," the actress told BBC Radio 1. "I cannot really keep up with emails, so the idea of Twitter is so unthinkable to me."

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2.
Keira Knightley

"I did actually join Twitter for about 12 hours because I tried to be down with the kids and it just creeped me out," she said on The Jonathan Ross Show. "I didn't post anything and I was under a false name and I think because Chloë [Grace Moretz] followed me, suddenly all these people started following me and posting, 'I'm having a cup of tea now,' and I just got completely freaked out ."

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3.
Rachel McAdams

"I listen to the news on the radio. I don't have a television and I am really bad at e-mail," McAdams told Peopleback in 2009. "I'm really ignorant."

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4.
Sandra Bullock

"We're not representing our lives truthfully," Bullock told U.K.'s The Times. "I will not take a selfie that I can't erase. I don't post or do any of that stuff."

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5.
Mary-Kate and Ashley Olsen

While the twins have abstained from creating social media accounts of their own, citing their desire for privacy, they did post their first-ever public selfie in an Instagram takeover for Sephora in April 2016.

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6.
Scarlett Johansson

"I don’t have a Facebook or a Twitter account," Johansson told Interview. "I can’t think of anything I’d rather do less than have to continuously share details of my everyday life."

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7.
Emily Blunt

"I’m like a dinosaur with that stuff, No. 1. But it’s also not really an organic sort of fit for me," Blunt told Vulture. "I can barely remember to text people back!"

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8.
Jake Gyllenhaal

"No one is looking up. I take that seriously," Gyllenhaal told USA Today. "I think it's saying something really important and a little scary."

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9.
Jennifer Garner

"I don't want any more guilt coming from my phone or computer," Garner told People. "There is nothing I would put out that people would want to see. It's probably best to stay away. They don't want to see me and my mom friends after kindergarten drop-off."

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10.
Emma Stone

"It seems like everyone's cultivating their lives on Instagram or on different forms of social media, and what pictures look best of their day," Stone told EPIX.com.

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11.
Kristen Stewart

"It's like you're trampling on someone's life without any regard," Stewart told Flaunt. "Everyone can do it now. Buy a camera and you're paparazzi; get a Twitter account and you're an informant. It's so annoying."

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12.
Kate Winslet

"It has a huge impact on young women's self-esteem, because all they ever do is design themselves for people to like them," Winslet told The Sunday Times. "And what comes along with that? Eating disorders. And that makes my blood boil. And is the reason we don't have any social media in our house."

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13.
Jennifer Aniston

"I was so stressed out, sweating bullets," Aniston said of temporarily taking over the Instagram account for her beauty company, Living Proof. "Seeing other kids on their [phones] all the time, it makes me sad," she told People.

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14.
Julia Roberts

"Listen, I don’t have my head in the sand. I’m aware of the different outlets, however you label them. It’s like people talking about a TV show: I can be perfectly aware of the TV show and the story, but it doesn’t mean I watch it. I have other friends who watch it, and they tell me about it," she said in InStyle's June 2016 issue. "I mean, we were talking about Instagram. Everyone has Instagram on their phone. And I just, yeah, [if I had it] I would be looking at it all the time."

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15.
George and Amal Clooney

"I could easily say something stupid, and I also don’t think you need to be that available," Clooney told Variety.

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16.
Mila Kunis

"I just don't think people need to know when I'm going to the restroom," she said on The Late Late Show with Craig Ferguson. "What am I gonna tweet? Like, 'Hey now I'm moving from room to room.' I don't really know what I would tweet."

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17.
Angelina Jolie and Brad Pitt

"It's a scary new world," Jolie told People, calling herself "old school" when it comes to technology. The actress and Pitt hired a security team to monitor the social media content that their kids encounter.

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18.
Daniel Radcliffe

"I don't have Twitter and I don't have Facebook, and I think that makes things a lot easier because if you go on Twitter and tell everybody what you're doing moment to moment and then claim you want a private life, then no one is going to take that request seriously," Radcliffe told Sky News.

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Jennifer Lawrence

"I will never get Twitter. I'm not very good on [a] phone or technology," the actress told BBC Radio 1. "I cannot really keep up with emails, so the idea of Twitter is so unthinkable to me."